Yesterday, I began creating some playlists for output to SD cards. I had set the number of simultaneous conversions to 4 and everything work well. I made some adjustments this morning and increased the number of simultaneous conversions to 8. It started the sync but was only doing 1 conversion at a time. I have deleted the device erased it, renamed it, restarted MC, and tried 4 conversions again. No other software changed that I am aware of overnight. It will now only do 1 conversion at a time. The version of media center is 28.0.34. My MacOS version is: 11.4 - I am running on an iMac Pro.
Any ideas about why this would have stopped working?